Tony’s cute little apartment on 21st floor is great, I stayed there for 10 days, it was comfortable and I slept well every nights!
BTS(Saphan Khwai) station is right outside the building, DMK airport is 30mins bus(A2 bus) ride away to and from the street of the BTS station. Apartment is high up you don’t hear traffic noise, however the AC unit is bit loud, perhaps to some noise sensitive people, but it didn’t bother at all. Having a kitchen, a full size fridge and a balcony was a big plus!
There is no wifi inside the apartment, you can always go down to the lobby’s lounge to use.
As for the check in, you will need to have a little patience with the security procedures, because this is a residential building not a hotel.
I would stay in Tony’s apartment again when I return to BKK.